Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ce401f8af25dbf…

MALICIOUS

PDF

83.7 KB Created: 2021-06-30 02:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f10e491c4c690d3751b8b6a526c7edcc SHA-1: b4d98e0d4fcea967aada729233db3b834276aca6 SHA-256: 10ce401f8af25dbf81427c36d5cb4fbeba2740e7579a53e1a03e383e3351797a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3a76c381bb13ae66ca16432bfdad9faa/94770795477.pdf In PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/0190762e39d3fc641422f839d62f4312/35936246851.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/71184409.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/8933009274.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/270546496920.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608958a249ed1---6195908327.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/38476356240.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fc4e73f9c---jodapovun.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/19707192754.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/24234351787.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/jewizojunujovujowitel.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/69721272767.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/a283b6950b3db3119aa181866ec9cb22/81538042092.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/obds7p9m3dpik8fkujum56h4s5/zilezexuvazekajuna.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c9e57252f93ac408bbc84de843fb5dbf/besumexifit.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/91414336621.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ef18dcbff9422331c6cc0a07635b7522/96456281500.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/vikujajubog.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/mutinu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/15540492306.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/33364814139.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608349c2ae0ff---14217227232.pdfIn PDF document text
    • http://funperm.ru/content/file/98385669359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=thunderstorm+30+minutesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 10664 bytes
SHA-256: c5f067fcf4eb26ab7ca1ebc4ec65bf9013194d54364fd89b23e5acd0ae5b486b
font_01_sfnt_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 16808 bytes
SHA-256: 9d8d68ee5c914a2dacc1f0418bf4a3c7fd80a77d26ece762ce9e40d0650d2e78
font_02_sfnt_off000129d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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